Package morfologik.fsa.builders

Class ConstantArcSizeFSA

  • All Implemented Interfaces:
    java.lang.Iterable<java.nio.ByteBuffer>
    final class ConstantArcSizeFSA
extends FSA
    An FSA with constant-size arc representation produced directly by FSABuilder.
    See Also:
    FSABuilder

    • Field Detail

      • TARGET_ADDRESS_SIZE

        public static final int TARGET_ADDRESS_SIZE
        Size of the target address field (constant for the builder).
        See Also:
        Constant Field Values

      • FLAGS_SIZE

        public static final int FLAGS_SIZE
        Size of the flags field (constant for the builder).
        See Also:
        Constant Field Values

      • LABEL_SIZE

        public static final int LABEL_SIZE
        Size of the label field (constant for the builder).
        See Also:
        Constant Field Values

      • ARC_SIZE

        public static final int ARC_SIZE
        Size of a single arc structure.
        See Also:
        Constant Field Values

      • FLAGS_OFFSET

        public static final int FLAGS_OFFSET
        Offset of the flags field inside an arc.
        See Also:
        Constant Field Values

      • LABEL_OFFSET

        public static final int LABEL_OFFSET
        Offset of the label field inside an arc.
        See Also:
        Constant Field Values

      • ADDRESS_OFFSET

        public static final int ADDRESS_OFFSET
        Offset of the address field inside an arc.
        See Also:
        Constant Field Values

      • TERMINAL_STATE

        static final int TERMINAL_STATE
        A dummy address of the terminal state.
        See Also:
        Constant Field Values

      • BIT_ARC_FINAL

        public static final int BIT_ARC_FINAL
        An arc flag indicating the target node of an arc corresponds to a final state.
        See Also:
        Constant Field Values

      • BIT_ARC_LAST

        public static final int BIT_ARC_LAST
        An arc flag indicating the arc is last within its state.
        See Also:
        Constant Field Values

      • epsilon

        private final int epsilon
        An epsilon state. The first and only arc of this state points either to the root or to the terminal state, indicating an empty automaton.

      • data

        private final byte[] data
        FSA data, serialized as a byte array.

    • Constructor Detail

      • ConstantArcSizeFSA

        ConstantArcSizeFSA​(byte[] data,
                   int epsilon)
        Parameters:
        data - FSA data. There must be no trailing bytes after the last state.

    • Method Detail

      • getRootNode

        public int getRootNode()
        Specified by:
        getRootNode in class FSA
        Returns:
        Returns the identifier of the root node of this automaton. Returns 0 if the start node is also the end node (the automaton is empty).

      • getFirstArc

        public int getFirstArc​(int node)
        Specified by:
        getFirstArc in class FSA
        Parameters:
        node - Identifier of the node.
        Returns:
        Returns the identifier of the first arc leaving node or 0 if the node has no outgoing arcs.

      • getArc

        public int getArc​(int node,
                  byte label)
        Specified by:
        getArc in class FSA
        Parameters:
        node - Identifier of the node.
        label - The arc's label.
        Returns:
        Returns the identifier of an arc leaving node and labeled with label. An identifier equal to 0 means the node has no outgoing arc labeled label.

      • getNextArc

        public int getNextArc​(int arc)
        Specified by:
        getNextArc in class FSA
        Parameters:
        arc - The arc's identifier.
        Returns:
        Returns the identifier of the next arc after arc and leaving node. Zero is returned if no more arcs are available for the node.

      • getArcLabel

        public byte getArcLabel​(int arc)
        Specified by:
        getArcLabel in class FSA
        Parameters:
        arc - The arc's identifier.
        Returns:
        Return the label associated with a given arc.

      • getArcTarget

        private int getArcTarget​(int arc)
        Fills the target state address of an arc.

      • isArcFinal

        public boolean isArcFinal​(int arc)
        Specified by:
        isArcFinal in class FSA
        Parameters:
        arc - The arc's identifier.
        Returns:
        Returns true if the destination node at the end of this arc corresponds to an input sequence created when building this automaton.

      • isArcTerminal

        public boolean isArcTerminal​(int arc)
        Specified by:
        isArcTerminal in class FSA
        Parameters:
        arc - The arc's identifier.
        Returns:
        Returns true if this arc does not have a terminating node (@link FSA.getEndNode(int) will throw an exception). Implies FSA.isArcFinal(int).

      • isArcLast

        private boolean isArcLast​(int arc)

      • getEndNode

        public int getEndNode​(int arc)
        Specified by:
        getEndNode in class FSA
        Parameters:
        arc - The arc's identifier.
        Returns:
        Return the end node pointed to by a given arc. Terminal arcs (those that point to a terminal state) have no end node representation and throw a runtime exception.

      • getFlags

        public java.util.Set<FSAFlags> getFlags()
        Specified by:
        getFlags in class FSA
        Returns:
        Returns a set of flags for this FSA instance.